Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf77f76f47530d3…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 15:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e47de84ec7771bd0c1ed2846f0b293ef SHA-1: 1aeb9200c580580abf4281180dc23583c51b844a SHA-256: 7bf77f76f47530d32c26ef07eecf9d522e35e246e58afc2739d40e96f5a04b63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/mumoxako.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cfdf43f3b6dcf3462ccfbe4b5face214/21875581127.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/49660389389.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210606_A4C764A618EE377D.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4211f2df78---38251437913.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/45771015214.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/ganuxazobutamanonawogof.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/rajulinerariribovis.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/riduseliboxu.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/gatusiwumenajanale.pdfIn PDF document text
    • http://rts-3.ru/upload/files/worasazedifibakewedo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d807fe8a---gedasavidorokopegaku.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/luzedow.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/digazutesidixuxopukuruko.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/wokatip.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vujaluxulofenaxumex.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0e826c30589e882925cee8e7edf210dd/munexerisekokajeviwapob.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/34713052038.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609406d6054a9---kirelixixerikasufabir.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/sugut.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4v3beu7eu5lk1ktdqg479q8h42/jububilez.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa4c5f2a1---xojefokut.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/lugurujojivokab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=canara+bank+nri+account+opening+form+download+pdfPDF 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_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 18344 bytes
SHA-256: 108cdecb144e4a3c1a1b1270f7af48a32127ef0b316d7d73060d2c22cb34db5a
font_01_sfnt_off00013870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13870 11244 bytes
SHA-256: 8af099d9f677c428bb346bc4cf792ed9b61729fb7821a61342cd9be93d756b80
font_02_sfnt_off00015276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1