PDF malware analysis — malicious · f0cb1013a69092e2

MALICIOUS

PDF

89.1 KB Created: 2021-07-22 13:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 3e3e3b08a8110e5b7f6ba9bf51d1d6bb SHA-1: dcfafcd07d9c5867afc3b0ba94d5c036f5b817a2 SHA-256: f0cb1013a69092e213b1bc13eabe7b66addcfdcb2316c9ff35e3281fcad6589f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads or disposable domains. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 http://sumosushingrill.com/uploads/files/bipilijexun.pdf In PDF document text
- http://wannawwannie.pl/userfiles/file/24461137519.pdfIn PDF document text
- http://artkulinaria.pl/sites/default/files/file/9051006616.pdfIn PDF document text
- http://rocincorporated.com/domain.com/images/dynamic_pages/file/geniridavisezogosobude.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e3c94430d97bd037799412ba61c32def/ninezubodarugixi.pdfIn PDF document text
- https://alshamiltrading.com/alshamilfiles/file/zedatasapudofudowitu.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e43713738f8---41577952477.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdd999648---nukemejo.pdfIn PDF document text
- http://abbwingslynnhaven.com/uploads/files/14359181328.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d48ecec84---45424596014.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608378e68ea99---60084185092.pdfIn PDF document text
- https://briljant-maleri.se/UserFiles/files/37894248604.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a71723ded1c---videdosixina.pdfIn PDF document text
- https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/71403244237.pdfIn PDF document text
- http://delshadian.com/public/userfiles/file/701376050.pdfIn PDF document text
- https://aslplastic.com/ckfinder/userfiles/files/39339513277.pdfIn PDF document text
- http://flightshop.jp/images/blog//file/78700290725.pdfIn PDF document text
- http://castel.lu/userfiles/files/85964001697.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23f20e6eca---pizanevuxawub.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077a544bb8b2---1790068116.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ee29d856292---30046066235.pdfIn PDF document text
- https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6485cede51---xugusi.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d8516959994ae10aeb32e3f03f049f73/39880583833.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440fcc6eaa---nuredanobiwawepesukik.pdfIn PDF document text
- http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27289b82c---rejol.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=congestive+heart+failure+is+caused+byPDF link annotation
- 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_off0000f831.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF831	16952 bytes
SHA-256: `d5849be15b7e2b03cacff5126ffb2a0d247bb2310d7af79d5a652a5627ee905f`
`font_01_sfnt_off00012423.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12423	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013c3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C3A	11204 bytes
SHA-256: `e02649477333cf588dd4c13f350ba3800adec5ef47a52218809eae58c27d4afb`

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