Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0172ccb5f931ea…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ce435de19b923f29a88e9b12129d2d9 SHA-1: 952843acb49199e92676c82d0648cd0842b35a19 SHA-256: ae0172ccb5f931eab7a0f4449d2589180d152b02f034803234bff4c48de616e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5837c4d0b7---jomasoxeduvulunaj.pdf In PDF document text
    • http://inphilong.com/upload/files/56273685528.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5feb1eb93---buxez.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fc704524---womawapusidolizo.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/jekajixukasozu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f9ace190---pufepazitova.pdfIn PDF document text
    • https://adikketiga.com/contents//files/78577329482.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xubuziwanenado.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/kopugadimixakigu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609946f50cebc---93441003524.pdfIn PDF document text
    • https://buyafranchise.org/files/files/9848440364.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088241134c7c---mifewaliweradujawavu.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/xenazowobikojonabibidi.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/49969942484.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/83397337081.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/74123494285.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/lajaxopivukivejaw.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/46847250818.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/28112506729.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f106c8ec719b8ae6b87b7833e29096a6/filinetaxijujapazusi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d6c3b3dec28e6de4dfeda1e37592a92d/28971656166.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/45865304407.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafagusegoros.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/28862ee8a5c4d21e5c5852e9c9e54bf7/saxifewo.pdfIn PDF document text
    • http://maxbrio.kr/files/files/19372104373.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16079d49f96694---datepovumedezimigepazuj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a9101d79f---xixuxisarurekajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=paasche+d500+1%2F10+hp+manualPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 10812 bytes
SHA-256: 6319d886e0c948d44ca58e29185ab8e7eb58a1b5801f54afadc754968e3ce73e
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 17440 bytes
SHA-256: 4d8c445b3078f00a3a4935e3445bcac47c956b726484f4ceb5d266f2aecf5699
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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