Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfef21014ac29671…

MALICIOUS

PDF

76.4 KB Created: 2021-10-04 12:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2603a0a9cf4adb12ff4cc401916835fb SHA-1: c1b229b7cefc6cb07fa1e7eb490263c05cd66229 SHA-256: dfef21014ac296711b8ff4cce1359c6204f587262d7166e67c3b70848e326248
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 domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using compromised sites to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://architettoangeli.it/userfiles/files/putovimunudomepagal.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ced00778---mutuveruwavodokoso.pdfIn PDF document text
    • https://susta.vn/userfiles/file/luvaburabisa.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/badexeboru.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/sorukidefumogad.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/leridapizudewuwobakofizo.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/vuwirirobonovedisigob.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/97617979546.pdfIn PDF document text
    • http://js-space.de/userfiles/file/72046318998.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/dutajizeseliwifaduwupapa.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/zuxatitawuwuvaxudegubatax.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/vataweruxugefomaselo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd248c5240---fatofadegumega.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a6c936d0bc5a6431f8b007c89dd13070/79389977329.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/wamotabekujesututisusu.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/47089479237.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/64810416096.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/pifufo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16158c52714bcc---28399590742.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/24170329893.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tegoj.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c76ee1ee8e631463c3f3e25b7d557edb/tonetafatevit.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/fuwivibet.pdfIn PDF document text
    • https://tele-video.ru/upload/files/98612580328.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/36362670283.pdfIn PDF document text
    • http://torgoborud.org/images/file/luxenoxaxovakedasudubes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=can+porygon+evolve+in+pokemon+questPDF 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_off0000c2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E8 11144 bytes
SHA-256: 4f74f84b36d60059f733b49388473cdebf9cc393cd26a9c3ca12c8d732d827e7
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 18064 bytes
SHA-256: e3cb3dcaa4f57af39280d0753cb42e75c27cec23d2a1fe86514f5c6f216af722
font_02_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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