Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9753bc64bfefd8…

MALICIOUS

PDF

111.5 KB Created: 2021-07-05 08:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1803ef5441ee8fc19642009f31877323 SHA-1: 0ab9e6ecb20f12df8e014de1082e76b571cc9141 SHA-256: 6e9753bc64bfefd8f00d26d2504a3e616da120279a843e0c13ccea04709fe043
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it is designed to lure users to potentially malicious content. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 6

  • 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 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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/18d3b51be4f8af1d1c9cf7f8a8dd96c3/92894887974.pdf
    • http://aucoindeshalles.fr/menu/file/84455123641.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rrv9jkrideha6nuo1dpl1jd04t/rejenabederabizifupiriras.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cc13c322---80498327427.pdf
    • http://profil-metall.de/content/uploads/file/96027278669.pdf
    • http://zuche0551.com/upload/file/bevepifivesixokosumokumur.pdf
    • http://studiomalpocher.it/userfiles/files/xinigat.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b609362511f1637eded23b1bdd8ef401/75109079089.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9896d17046---73355441947.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210623005849.pdf
    • http://mid-europe-ex.com/images/blog//file/90217339168.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080d552bfee3---57233727334.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3v5csalptg9jer1tdcuv0t152o/mepajato.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5700f868---gokizexudunawoxosigoziju.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297216160---jirapinotabipevorud.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c4e41dfe8---59041120538.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f20a1594b18ac7f7d9dee35423c1d709/49807624520.pdf
    • https://ht-cooling-j3t.com/contents//files/9582618282.pdf
    • http://yulintimber.cn/d/files/94652490946.pdf
    • http://szao-spb.ru/images/news/file/22088215325.pdf
    • http://ilturismoinitalia.it/userfiles/files/banodifetigofik.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069f6d9121---logufagavo.pdf
    • https://mama-light.net/business_school/uploads/file/venexovakifomu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+meaning+of+at+least
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013d17.bin
fae7e65a0bb2c644cb023f7b5a41ba5fc23af01a01c2fba3e656744cf59c3475
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D17 24632 bytes
font_00_sfnt_off0000fb28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
font_01_sfnt_off0001133f.bin
f569a3150838f851f6476e81512a07a76f06a8aefd7b16ad8fd5394cf8208350
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 10524 bytes
font_02_sfnt_off00012af9.bin
c698164fd142dee593497aeb1faca580b10386978a5e7b7480d7b5172a8abd7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 4816 bytes
font_04_sfnt_off00016bfb.bin
24c94d6a877726a165efbbb8325b55f790f70fe8ff2fc7f9e03c134b766b2f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x16BFB 28096 bytes