Malicious PDF — malware analysis report

Static analysis result for SHA-256 8600d44f87633fbf…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 03:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c7df3a9dadc8fdc14a1eed668d89a06 SHA-1: 42814be299a7f3fd3fa2af5e97a3b4457e6c401c SHA-256: 8600d44f87633fbf91d6116dfc305eae9d19281335ab31251e9d3681bdf4370e
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, likely to distribute further malware or conduct phishing. The presence of multiple link farm heuristics and the detection of a compromised CMS upload link strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17504320e9---21103646111.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/9551259520.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/99892305415.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t0vbltvckoitfoj0raacrofamu/lezakevorazuzesofirepo.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/52079116385.pdfIn PDF document text
    • http://jngf.cn/files/file/fusunonajof.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/38070088771.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gemexil.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd66d049a88---75518521326.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/tulakobofoxupupokoxi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609014957aeb9---kikofoduxepajilel.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/xenowazonujorol.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/12114116156.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/11def1172106804728ae252767101b7a/72968900029.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f7b3e487023fe7772b573b2b525fccb0/kofodo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/flumef0v07v8jc8lfn63m4jc6r/wotivimaw.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d932c88028---38929749103.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/94568853597.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/67636030791.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/idc67p89ib08cv02b16mf0ktl3/71769432425.pdfIn PDF document text
    • http://rilta.net/userfiles/files/femugadepilufudepef.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160844a2994b2e---43351989889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+address+letter+to+whom+it+may+concernPDF 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_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 16736 bytes
SHA-256: 735484bbd67faf464d754459e69c6840e4f07fb0ca1f3280a508584f8c4dcb2a
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 10828 bytes
SHA-256: 1cf460f332879193f6ad024a55f9d1db6a627ad889a11ead0eeae98816e9dfdc

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