Malicious PDF — malware analysis report

Static analysis result for SHA-256 0904a5d4525bc369…

MALICIOUS

PDF

130.3 KB Created: 2021-07-05 07:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 509ae855194cf7729365f7eec6fa7471 SHA-1: 4ca925486c441d17d55187367ae00add4170efe2 SHA-256: 0904a5d4525bc36915a7cd2cd2f3b240ff9a019f8fa5fa910f74e965436f7501
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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://www.awakohchang.com/image/upload/File/adixefidamog.pdf In PDF document text
    • https://areicon.com/images/file/18389860653.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fe3eb728---fasumukikuwuxasiza.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/bazofabogirolikezumupe.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abb418c11---1001858518.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/21802654647.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5acd07a4---27719877969.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gnne2gcf3u2lcms4r3nlqou841/63302636597.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae6408847---tixewopazopoxuxewoj.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/25798726922.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/98225502057.pdfIn PDF document text
    • http://aimic.com/userfiles/file/jawazatuvosogoxiri.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607427458e074---mogetopupakewugul.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/48166358941.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c3b05e8db---votokolisibejuzugalox.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7e6f3c19---79349145579.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0c083217da77f00b2770dacc202918c8/11472748538.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160998a5dd1d06---5657938780.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5d9c368a22675a93a23b91957c7c8cb1/midixotanim.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37052589063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nerve+shattering+meaningPDF 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_002_off00013218.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13218 26512 bytes
SHA-256: 5e671e68d19f73156fecdb9c21a94c92529bb6e3c48174e41368653725aa552e
font_01_sfnt_off000163af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AF 32988 bytes
SHA-256: 9b1de991ebba2af71c20645001a39ad813b17b184aec80ad49ea6be2215554e5
font_02_sfnt_off0001af6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF6F 10432 bytes
SHA-256: 71704e005101164a727230e42dbd67ade06c6d55392c4ea604aae65ec3102cf0
font_03_sfnt_off0001c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6EB 8668 bytes
SHA-256: a28140b79ef3697cd9e2d4fa48e1464346682af0090fd0d3052a7ac9397d662a
font_04_sfnt_off0001e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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