Malicious PDF — malware analysis report

Static analysis result for SHA-256 2873e0b7dc737321…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 11:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e9450306609a2a77514a2feace7cdc1 SHA-1: 9726f90826014e397d39aa7f81bfd8023f750a33 SHA-256: 2873e0b7dc7373217e571c77dde704740c3e058b8ee12c2f197d911ecf225d8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=watch7deadlysins+season+2 PDF link annotation
    • http://gsemilia.it/userfiles/files/legiw.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/98183586693.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/45262022478.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/kulipovajepeb.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/26065386930.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/lefidaxodaxip.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/19562540356.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/96192885357.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/96460385571.pdfIn PDF document text
    • http://skncn.com/u/files/tafolekajerupudojamatiz.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/68397215509.pdfIn PDF document text
    • http://kechengchem.com/upload/files/mamep.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161436c14e009d---30626535765.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/52513328881.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/141009333.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77654185849.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161404ad609c95---14919949913.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-14/20210914175237311619.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161334ea817bf3---getugoxorutodinu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wuvivemidupixadimutamud.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc165a307---58221240778.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/2047883560.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/42739123355.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/daronajuduxok.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/labijikenes.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.

FilenameKindSourceSize
font_00_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 18156 bytes
SHA-256: 7a528b02110405f98e380529327b12991ccdc5e9a81d4d07a06a1e7a323ea730
font_01_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 10644 bytes
SHA-256: e76c1706f09972912618c87c3e0b601aa56f678b70ed98d27e31a2f4a7dae987