Malicious PDF — malware analysis report

Static analysis result for SHA-256 332dbaf0f2022a03…

MALICIOUS

PDF

75.2 KB Created: 2021-07-08 18:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad2c019cbee598b1b3c27114046ec582 SHA-1: 7d686d7576d49cec07be653150ed11364a9c2fab SHA-256: 332dbaf0f2022a03ee7441d00d39b6b493b08df1cb403b523a4020fd35ad1dc2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://fandimnarodaku.cz/upload/file/38795334229.pdf In PDF document text
    • https://mmszke.hu/files/file/69204339683.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/15647117008.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pifuwakesap.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48a9ee78b---jogalovo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90184c6ace---24538573090.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef1f899177---nupamusiwepelove.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44083434d---70953371453.pdfIn PDF document text
    • https://lecachet.fr/docs/files/28791762174.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jotofuxisiweteloj.pdfIn PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/71821973578.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0fc9132889e7ce8bfd10abcfc6e331c9/480352741.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/12748560255.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e9ca8780f6e13e054b8e71cdabeda812/73902027445.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a926eaab2d9---wovolig.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42474435214.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d36528eb016---keremafakimalexaze.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841c297838---58377832385.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/13617780195.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/34854517786.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc9f04f8b---xusitefozunasesakubenibe.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc385a2353d---gadiwejijixaxun.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960434ce261---61316180837.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/77247832211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convert+scanned+pdf+to+editable+word+documentPDF 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_off0000c2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E2 11204 bytes
SHA-256: 22ee9026242d006898d5c04586e902675bb63ae831c6cb2d1f67c7c0def31c5b
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16244 bytes
SHA-256: c86eb4dbdc7a58a0e7826c813de71a264cb0f8e29fe3ceba2f7612d6aa9a2136