Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fb8f1e3438b11b…

MALICIOUS

PDF

84.5 KB Created: 2021-07-03 18:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce1227df64f183eb47aac012a1c78585 SHA-1: 017b5d0cd3ebb877ed2da3be9cd68adfeae59df8 SHA-256: 31fb8f1e3438b11b181c1a87afc099babe538267cf573f2d1e0fe671aa774069
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links strongly indicate an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://coretry.ru/uplcv?utm_term=taking+the+derivative+of+an+integral
    • https://netiko.ge/img/Data/file/pukawuz.pdf
    • http://lyshiying.com/d/files/nigoxokavavidotuk.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da51c20f2---96830224418.pdf
    • https://sasalidayanisma.org/uploads/file/lugutofoxukeva.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070841d51e0a---xinus.pdf
    • https://adreshosting.com/calisma2/files/uploads/17631953739.pdf
    • http://simonide.org/userfiles/file/robuzemokilasamu.pdf
    • https://baigiangtoanhoc.com/upload/files/letavudobuzu.pdf
    • http://nw-line.ru/generic/uploaded/23394462412.pdf
    • http://tunglamgarden.com/images/fck/file/joxavugoxokopozuvimamube.pdf
    • http://dioceseofniranam.org/userfiles/file/jotip.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/surerim.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a5baf44b---gexopuvikalone.pdf
    • http://lws-realestate.com/userfiles/files/49794758994.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/11d481e0d4817f6d1e307f8b5918f68e/xisivibobatedugul.pdf
    • https://soudurelauziere.com/upload/editor/file/56367274395.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/vixixivabewotoz.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/of2jptp1hv3i95ihr75jfa57r6/32239772674.pdf
    • http://dothi.info/images/files/53993714200.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/21361554044.pdf
    • http://chronocertif.com/userfiles/file/27453998709.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a76430455---14384010768.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/fff3ae5bd5638a285d031d6200ea25c1/ginifijexejibaki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e606.bin
d35d43ae1c469cdcba1a9bde2685778f6e6412550d471d60a8f6420dc8c07dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 17852 bytes
font_01_sfnt_off00011494.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 16792 bytes
font_02_sfnt_off00012cab.bin
2571a4485faac3269a4697027709c7e07503c493ce254fe3bede190d927ddca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAB 10584 bytes