Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac6c4335ce07228…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c8d02f5ab95356a1ee92de24835f8e7 SHA-1: 9f0d3d524368f0a96daf020c25b98badbbc43d89 SHA-256: 5ac6c4335ce07228ff88c01f49c5962ac0866eb189f46d0927027cd0811a3361
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. This suggests a multi-stage attack where the initial PDF serves to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://littlepearlbooks.in/data/eimages/file/toxiwape.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-9/20210809180613243308.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/94283437418.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ug1a53727aifjpc7d5r4ld7q1/29192593863.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/46019480598.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/natixaripiposurodabem.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/lonezojapow.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/39380492326.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/86621223030.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/409208db9c07d2147440ddc456bacd23/9489461192.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqa001iaibtheug2cbst6jitje/devufisu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6a5cf5d26583bad23e0daad1fe22f2f5/suxibimejo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5bb751435---jimoduregumomome.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/lupofow.pdfIn PDF document text
    • http://inncredel.com/uploads/47875580990.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xeraruloropami.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/lanilisukapimulujimadeg.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9e12b0ca0---12977305296.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dumatasojasokuvir.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wagavulupurimopisopabo.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/fesizodutavuva.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a109f890e20057acfe40e0d5ab8df10d/71144506498.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/57159998573.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218580d6af2---maxuvikazokuwewuxorujob.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/77362922433.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/92877a5ca3f8af4963ceb8d4c79cf793/28055792487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=eml+file+to+pdf+converter+onlinePDF 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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 10500 bytes
SHA-256: 62d54ec7856401a5aa989fc353dfa74998b0c912707efe85b02b5a6f5a84817f
font_01_sfnt_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 17180 bytes
SHA-256: 0b7e3e56012392d53ec032b5243de0f554388dc532d5b7ad29f477d50900eccf
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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