Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbf747edbbbe666…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 10:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cedd81c807b23b65557683411e8f24c SHA-1: 0e2069ce2d26d4b71cc76bf4608789222dfed786 SHA-256: 7dbf747edbbbe66658f4d7ae2b827f4eacbe30f18b324b634d5cc6f958cdc5c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5fed721c3348669e329c2bb23899ece9/27180109941.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/97901429815.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o0hcejk85qv4m2ee65epahmfq7/90997603851.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96f23aa1c---bubaniwo.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a3cb2399f---43496156892.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e817ea0821f308d0a31ae75221de1f38/16740058938.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/shtnin1gamm3pq7dj2q4rrahrq/33917372931.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d37f20466e---tujiv.pdf
    • http://laweasy.kr/userfiles/file/50164001501.pdf
    • https://mimpishio2bet.com/contents//files/bifemapilunopog.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce9ba3fc9e---84751636.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dc6e7654---31773679813.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/fifipiwelana.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6c99c1a0---48993503134.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61cc0e5e17---bawimiwa.pdf
    • https://livre-art.com/ckfinder/userfiles/files/3746228309.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd9b42d772---1299537766.pdf
    • http://chikatere.com/Upload/files/82648455039.pdf
    • http://pulsarvn.com/media/ftp/file/nakizanigudupovu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nek0tgno60oft7g9jqf5hiuka4/93762062933.pdf
    • http://dainichiji.com/upload_ckr/files/jutof.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/f88am9rdt4t0hspk5rm0prva33/madaguponi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rose+red+tattoo
    • 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_off00011040.bin
fbb167c1b7e6749204e8179d51d91109eab44aef8847695fad836e1e821e245c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 18208 bytes
font_01_sfnt_off00013e5d.bin
9d81de2407f49e185b32a4cb040d82c0abddfc7a2c64049e7fa66ec74f6c281f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5D 10044 bytes
font_02_sfnt_off000154db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154DB 16792 bytes