Malicious PDF — malware analysis report

Static analysis result for SHA-256 998399d72c016ae1…

MALICIOUS

PDF

116.8 KB Created: 2021-07-04 13:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4164f5af049ac22f4ce6a2f2ec5f1ef7 SHA-1: 2ac9d533d241b2d018d4246929d615065a30b428 SHA-256: 998399d72c016ae1a8d7a5ba022d743c35233c011c6088eaa3b219f532bc71fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9676

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://synowka.pl/galeria/file/46259024850.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/615da5fc0813df4c90135f608a868fcd/67060184081.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/kiwumasogadelefonudiw.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c13b69452ed18313d80a4c83eb8bbaf6/nubaguzipavevo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c35c7798---14181145370.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd87f17fa---27128484185.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/46541509036.pdfIn PDF document text
    • http://yuhongzg.com/d/files/damovowelaf.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087487298a9b---bowuvowebogaw.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fdfc7d39---54607497183.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/zalurusoxutalutakoti.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/13950611517.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/29720303790.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04eb830e1---wizamemesetorakigogib.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97930d1e9---miwujaruvojedemuteberesa.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7315bb2e4---kimuxarivewakusunudiw.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c31191e59fe61e4c07b83739e49af677/zojikonikinib.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/gunuzowufovezujat.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/senosukijenorerikixuk.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/21m0jaf9da7gpinb4d1a17pe93/zitepetitutipaxuxute.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c03147bd6---sutaxukejilin.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/jijisiribenikubanu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afcca223d---5841604386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=21+off+licencePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000144d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144D9 26476 bytes
SHA-256: f7ce31e6681ebd97708bf7525165e3d8bb5258397245a6c551d3b5a9371126b1
font_00_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_01_sfnt_off000116e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 9876 bytes
SHA-256: e72c92513b27a509a1e35d850cefa23b43b23ae11ce8532217f2187335de3e67
font_04_sfnt_off00017812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17812 34780 bytes
SHA-256: d6dc5dc9cffdc16530be25d4b876d8378d4dc759d90952f63648eafb38d9fe4c

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