PDF malware analysis — malicious · fe728df0aadbec75

MALICIOUS

PDF

124.0 KB Created: 2021-08-11 00:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02

MD5: 2e43c826e209d19f377eb92226c44349 SHA-1: 8e039bdf6aa464c53b2e0fc38018846a4beb5ce8 SHA-256: fe728df0aadbec75a5e2ff6afde73dd6db7e8d7bf68eb4367293162ff6e1d150

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9795

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://inwebjor.ru/uplcv?utm_term=tesis+de+un+texto+argumentativo+sobre+las+redes+sociales PDF link annotation
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3ca0577076166ff207dcd6622a36625e/59941324656.pdfIn PDF document text
- http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984394ca5b6---nefapajuvuwesexit.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4d766de5554506ce3daadeffc260224c/gukiserazutajazeginowu.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/86b5r138c2smt4srtv0h8l3tu1/nazejufozupufawexaw.pdfIn PDF document text
- http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/nawasalosutejuliviwiten.pdfIn PDF document text
- https://vipbeachhouse.com/uploads/editor/file/14760025486.pdfIn PDF document text
- http://alpha-th.com/userfiles/file/xedefetaxupu.pdfIn PDF document text
- http://studiogeologicotrilobite.com/userfiles/files/24069856377.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1f2e98da---88310415752.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609936f9065cd---wabuxakuxevifexikux.pdfIn PDF document text
- http://www.anjhimayath.com/upload/file/xujimedaxi.pdfIn PDF document text
- https://jxloanchien.com/style/postimage/file/50441403613.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094baa6b21bf---wazimogapizidirofitonofi.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2226ec7a5f---vunosoluvo.pdfIn PDF document text
- https://tidaksusah.com/contents//files/maxivufezuluku.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbb737b8e2---kanuxebediwamorok.pdfIn PDF document text
- http://sage-chem.com/image/files/20210717_100142.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8307be5c70be50af4282e76e3b0b9bae/tepojudadaral.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a5597136---20816596594.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2e945ed1fefe655794ad505aaeca54c5/73749689995.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506043549658553.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18ad743df---duvemusugux.pdfIn PDF document text
- https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160873ab51efb4---56279676979.pdfIn PDF document text
- https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104d5375a995---43277840461.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gltvsbtm733spvo3p6fihi8m60/84982752181.pdfIn PDF document text
- http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/tukafofizadijimofoxu.pdfIn PDF document text
- https://bitree.ru/ckfinder/userfiles/files/46156666505.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000161a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x161A0	19696 bytes
SHA-256: `b3a10c08e5f26739ca3588c2bc8b2b160a1f1a5e964d16f5dcf4d03cca4c5739`
`font_01_sfnt_off00019443.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19443	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001ac54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1AC54	17040 bytes
SHA-256: `7bf174d1329b0e36d69110b551b40db17e82b30d0ba31db034f5410d3ce40bc6`
`font_03_sfnt_off0001c4e7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1C4E7	11084 bytes
SHA-256: `3ad93768e058691782dbc35f81c66f41940e90350db8a0c31facbac285d7dede`

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