PDF malware analysis — malicious · 957dc01f47e3d22e

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 14:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1bb761461c3a172bf3b9ad70ee8d4279 SHA-1: 9eef4069d854d3b28b163e6d049a5947619bb434 SHA-256: 957dc01f47e3d22ec611034e33ff23bcfe26f9c4553096deab01d68e2bbc2ab0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic firings related to link farms strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://garglob.ru/uplcv?utm_term=linear+programming+and+nonlinear+programming PDF link annotation
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e116fd5812be86db4050e8cc78225ce4/zupefuf.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c5268818c7a---fisozexujujosegefozaneju.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/14288b05822b630de16fc627c8b3dc6b/65442354416.pdfIn PDF document text
- https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/kjgp7b7hlhqo3psb6koip3dbk6/8406406885.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8adcbd58fb11a53a280547c9b1766fa6/komebesatufelawakibolafe.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c45989dce48---7540137608.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c941e29ed1---88775396834.pdfIn PDF document text
- https://zivotzaokny.eu/res/file/47207795983.pdfIn PDF document text
- https://www.passion-rnd.com/upfile/files/2021/08/03/86471384799.pdfIn PDF document text
- http://fthyhs.com/resource/docContentImg/file/2021-08-26/0aac0109b77c552fb848eb4a3ce452d5.pdfIn PDF document text
- http://simkoongschool.com/uploads/editer/files/51047024147.pdfIn PDF document text
- http://strandedtattoo.net/file/xidabojegomumemunor.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/72q6kqv6p1mdi8odcsgg9qhs70/47803144878.pdfIn PDF document text
- http://adams-gold.ru/archive/image/file/luwef.pdfIn PDF document text
- https://agermag.ro/mm/file/15159345764.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e5aec5cd---49022624881.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4e47e9d6---vidivanadujurowilan.pdfIn PDF document text
- http://jaluzipro.ru/public/userfiles/file/4741900222.pdfIn PDF document text
- https://tasivn.com/upload/ck/files/xowoner.pdfIn PDF document text
- http://adamlegal.com/userfiles/file/zafikidar.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16117eb6df3433---zozeneribevaxazibejajibov.pdfIn PDF document text
- http://chretkinia.pl/userfiles/file/45482388743.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ced7a19e7---jupelisujofegexod.pdfIn PDF document text
- http://ei-windykacja.pl/upload/file/tavufapanigomo.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a641cf457---posizalituz.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ebd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBD0	10428 bytes
SHA-256: `78ff2b481437e36d7491f9fac0ff689c1d964058318b4f620c25eac8d49a26f4`
`font_01_sfnt_off00010317.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10317	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B29	20216 bytes
SHA-256: `ca603c5f027bfd32b4ab66aa016eb784c25a31d00e473da69a7f142364150d73`

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