Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1eb909e867aaec8…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 09:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c36fd127c15676ee383cc95709b517d9 SHA-1: 903fe62ba7003aec630227f28e743be35f13b360 SHA-256: a1eb909e867aaec8c97f4be0da7c74b418f588480816b8981e2001fbb5451b5c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs, with several pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to lure users to malicious sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=best+android+games+with+controller+support+2020 PDF link annotation
    • https://officialbacknumber.org/editor_up/85352717677.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/furoka.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/27743005389.pdfIn PDF document text
    • https://xenonsvjetla.com/files/76669496878.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/81259603917.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/41840936393.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e732f16b6e8fbd22a8e9fe02e0644e5c/vaxijumapasebutemomedakak.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/10513531427.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/givejenev.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a872929c61---zaxawozegibolesebobono.pdfIn PDF document text
    • http://gdgom.com/upload/file/210904061732611975aonzboi9wf7r.pdfIn PDF document text
    • http://zae.me/datafiles/file/kewutugijatunefomofib.pdfIn PDF document text
    • http://korytnica.net/data/files/jusibunawifal.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8618ad84a---jatugovapibizisonewu.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2867ade4b---nigonuvaz.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/13617385310.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210917_085341.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/4477836388.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/girubutevetudaxebirofak.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/61350401827.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/23013957387.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/44839652098.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/jejudixesir.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/mexosijupudatozubizitinef.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16664 bytes
SHA-256: ed45c221ef794093894d9348a87d38c720e32ee851097d58e2e09fa218e761be
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 11444 bytes
SHA-256: b6ea10e7bad85048e959935e636a59d69d05fdd4db43fc93b8b5c3f489cdd994

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