Malicious PDF — malware analysis report

Static analysis result for SHA-256 7628dfb5c28adad8…

MALICIOUS

PDF

85.2 KB Created: 2021-08-12 14:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 595ecec4ae2a60eddef28acf80612343 SHA-1: a10155105d35863e337c7f2f5dcc94ccbb95956c SHA-256: 7628dfb5c28adad884ba55fed84af56d072866cb4f4e1ce9cc5e2fe18acd149d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coretry.ru/uplcv?utm_term=lenovo+thinkpad+t460+bios+password+reset PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b720bbe3cbff4455e143fc4083b87830/57769158082.pdfIn PDF document text
    • https://subarini.ro/mm/file/tanojamevarirosegalovep.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppo9oc327t43pmb93rrn3873s1/tojuri.pdfIn PDF document text
    • http://sushibelovo.ru/files/fibogesegesofatetu.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/46811336533.pdfIn PDF document text
    • https://majubesar.info/contents//files/27148379193.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/21/file/16684096355.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/5899104098.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6de551d505e9ee6a523be1307b5eb572/91835711074.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/zidosurijupesemuxaxawu.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jujakowumusanariba.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/rodinufazigedimo.pdfIn PDF document text
    • https://majubesar.info/contents//files/romuxewilologitezu.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/60959613270.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05bc5df6a---27756868539.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc3fe00953---dofej.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7a711223---20844099885.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/84418850465.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2d3fe8a450a64bb02298c5d1558ab5a4/digatovinada.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27da6a9fb6---86407646188.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b4264c4f1---46072996969.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4f2ac58e76a58f287525b8aa6caefaad/74042023261.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/86637269574.pdfIn PDF document text
    • 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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 11152 bytes
SHA-256: 8c1a5a3f837b47633140ec14938bf96c1a9176c9891a28d95fc300473d984e7c
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16708 bytes
SHA-256: 7132e955bc00137ffcc26a5560b8c2c5491b6afbc62219ec9d723e1202b6f653

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