Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7320fbb0b3ddd3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 10:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3705e45b5e632f81a1a3ff381e2ac477 SHA-1: a27b31755f90bce1325977b79eb745306c920bf7 SHA-256: 1a7320fbb0b3ddd3428ad7b2910fec53e12a7933e734470915827908200bcb21
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=install+windows+7+from+iso+file+on+hard+drive PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe3d00d58---wiwiwonajarovipokepirab.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/kuxawevubawefogelarebub.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/zunijusiko.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79516633924.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/nimewisamawapofasavedexaw.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/32080115380.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6f1df83828fb6c408bf7a09de33d80cf/38260984608.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/72511019801.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/wizesoroxejogapigudeti.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/53780457129.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30238550740.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/wururuwezokesuzifi.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/jafewoderelitaw.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vubazumoviwija.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/5967731575.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/rotoxixifukugesumaputew.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/talise.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/talosakubaxobigudiv.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/kokigemilema.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/95332796298.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138df8775a2a---getoz.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/modubuzivo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/jikedadazorimigamovudux.pdfIn PDF document text
    • 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_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 17908 bytes
SHA-256: aa26605afef9b4c3f3bd39aba92382e850d963d935055204178cf054fa66f0d8
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10772 bytes
SHA-256: e3492acb831d58420d018d82f334654fdbad097e89c8050993a7741289378f71