Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a8a5ac736efd19…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 01:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0004c7e0673d149d75b796beffbfc6c3 SHA-1: 7f1b4512d0629fc290b9d2321ba31025d01f1c7a SHA-256: 45a8a5ac736efd193cd6915ecb6984c9dc2c7ef81d811da27af642c14efe763c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://topinsolventa.ro/userfiles/file/90532761747.pdf In PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d8bdff8fa6235205e1f82c9d726a10b5/fijedepo.pdfIn PDF document text
    • http://artospace.com/pics/file/41882532728.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/rosopoto.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f2ecf9495ceaa74ea158144f2b1afdec/59468534506.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6d8925607d4af2af713785832e629d91/mujuku.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/6b2b80e7beaef4b7723bb6d610277620/42685355753.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/14921297526.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2ee6i4hf1e19vsjtudo6fogj8b/71037838434.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/jivefamupevegupi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f5b8a2df---49541877685.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/86020jlogthbj48k66elvtrv97/56283233596.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f0fa52aaa---82248678293.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/dezozima.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/s934m0l5k2rh4m1of5okfeock5/jotamupixotu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/90371c7c5bd00028613991c8d813c1dc/51974143908.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/25628034439.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/2r13hue14ea4kabiromcko0ajh/19222434433.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210701/file/84065272868.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af670cc076---91350086711.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/45797187772.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/gisuledafifobunemef.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160701196ad0f9---49907374387.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7ad6d883---84950050971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+many+days+are+there+in+7+yearsPDF 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10708 bytes
SHA-256: 4f9d385e19ce076c14f44adc9fb2fc22bbf9191943be0acbf7044b18c0f7ed00
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 17284 bytes
SHA-256: 4b41852f83a36579f311f6055d7088462d0d1aaf73167af457a8e2e15995dbe3