Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bb9158d7dc76fc…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 02:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 190bc60037a2defa1d7269b306704582 SHA-1: ececd634600506d241dc3aeaf952128c421f1631 SHA-256: f6bb9158d7dc76fcc7ac0bd3311eb4b9259072826d1a80da16141420a2c6a4f1
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm designed to redirect users. The PDF structure itself appears to be a lure, potentially for phishing or to host exploit code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kcde.kr/userfiles/file/liguxewaxotajilalejene.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ababebc9b08---nurokubev.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/9d130e7e366d5dbff38177dc8123fbb3/xuposajolisuniwifukir.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d7c9a9911---64548252776.pdf
    • https://drivetripper.com/userfiles2020/files/26143686855.pdf
    • http://engineersclasses4competition.com/files/others/65376076686.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4e1eeebd---47117699399.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/365a71abd4ab1e74fa63e84521ff15a3/71482032384.pdf
    • http://cupta.org/userfiles/files/20210610180509.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3rakjbjtfphun7p1qhjdphcq91/vipejekatuzulepino.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713d4694422---jejabixoberude.pdf
    • http://aircond.md/upload_fck/file/kibok.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/us2bmo9becahlkhoehv2dgtatn/kabikejizorobiwejudefuji.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dac3b4cfc---16075477520.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/05ef88d2186025b067a42ecc232e31ac/bodaxu.pdf
    • http://comp-art.ru/userfiles/file/vofakasobanorurivivoxera.pdf
    • https://llsindia.in/FCKeditor/file/26217340460.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3glo5e9ka727ntt3ungi5rc48t/zolepu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c474e592aad---zawitijulerifinarekumi.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/176b67dc6bd3cf92b95f36d28350be27/velajuwuwalirolimav.pdf
    • https://eviinstall.com/userfiles/files/gevofuwipoxoxefozojarufaw.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7f66158edf2a18278a4f20e3efd3344c/bajapexuzedalarododaxe.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3cc9f550---dovolutomejolaj.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ae6886319eb0f83b68d149be1cbef3c/61045732691.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6115ada3d6---dejusoxepomikureveji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=causes+of+shivering+without+fever
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a6.bin
2d7546a8faa2873dd0da067a62d6c9e95e705a202b01f5320964e8026a2355cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 17312 bytes
font_01_sfnt_off00011e21.bin
506934ab1fb23f760cba03e5f8cd33795b91be3d89c21e671cec3bc61ab947bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 10728 bytes
font_02_sfnt_off000136de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136DE 16792 bytes

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