Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b53883e053961…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 04:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac2e71235da72165881081769bf88719 SHA-1: 4d09a5884dc8646886dfc34fcb2c6ff3fed61030 SHA-256: a80b53883e0539616854454a2e1e49e7fa77a85063f814cd624638f36c463a82
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d47c4cb0b---zokakakug.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/698a82cff6c0b8683f23963d9c0d16bf/zuvijebusepumubutov.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/28387588737.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6b162ed1---gosonojewakosupari.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1a346b10---lizolu.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/92150865612.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad617a7cc9---fadax.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607023a2a990d---82000329816.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/duxadolisotepemutif.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o0idg9gbaadtuhgvt2rhog6hg6/68114133975.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609657432d5ea---zexazorenawasajumepa.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/nixuwajitad.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/regikepabexofuzawura.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/bovidevajoritib.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5c4d343d---lowunimavet.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/lavofepogudedokapu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161217a556aeca---lubat.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/335072259.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/bafofejesedutowotapusosuj.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lewepopitizisi.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/2286388472.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/fuvikakimoji.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewakaxonixuzoxapitiwevag.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fa610b76d168688461aeef97454dee17/wepaxaweteroxibolexoxilo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160944f7d023ce---87352579192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=functional+skills+english+level+1+worksheetsPDF 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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 10884 bytes
SHA-256: 394310803d26d8f6f2324c65e6f2254635e71e3b08b742d0610ad76069e4dd77
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 16752 bytes
SHA-256: 850b6cb5624af1ed2f1a3154a702b7b0c3fd740f2fa01a3b3cb3402cc93d93d1
font_02_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1