Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe738a3ec4743a5…

MALICIOUS

PDF

90.9 KB Created: 2021-07-31 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e0e514520d48502cb9dd3c20e44e150 SHA-1: 4cf6d6a1c31953f5bd6bbb0574f5693eb31b537b SHA-256: afe738a3ec4743a5212c06cd43df75271deb0f5e557fa5421193e64811213168
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160abc64147ed2---zonalutimigin.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/9n5t87agpov1svk8496rcsrp3f/9090046866.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/553459224b548f41af94b87622940588/36361315609.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f033aa9f2e6---53505289934.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/wilexolos.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e683132cb99---32427686379.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/jevatupadoxodepesufofo.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/78534046824.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/baselepikapebiwupef.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2h7h8eq1a20k8ndu8bs1r3oegi/71552074311.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/19313532941.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/6552295728.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ik6vo83e3v4u6qa3gkdn7qpau3/65775958569.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/34040469929.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225fe99f11---wasunukelabizizo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba295c1de63---41096885908.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/276dee3644a848e30cd29c9c6552aa36/12417731210.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/xosokozizegikawukitupigir.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/ef067c828447ed3175d365dadaf6cb42/96633243419.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/43184127897.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/16124407853.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/lowalupukudifalid.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/roziwati.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b2758f9d---rovuberemetazo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/bilitexakudezoliju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=flushed+away+full+movie+in+hindi+free+downloadPDF 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_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 16816 bytes
SHA-256: a1c5a4e878edee3a8b107cf384c9af0c043a53f8a56c639116b6dba78d8c1f4a
font_02_sfnt_off000144e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E5 10864 bytes
SHA-256: b8a17216dee91d5bc64ef183c5a1e87ee4bd97d7419893c4261453d3f2fce174