Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e375219a4d8993d…

MALICIOUS

PDF

110.7 KB Created: 2021-06-28 22:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f62cd9d0b0d915f04eac8b2df184f912 SHA-1: a331130771f4ae772facb2dc8b9f9e0d91e454dc SHA-256: 0e375219a4d8993d656f56fab5965d58dc127fb2697b66f421006d10277c355d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://mutitar.com/user_img/files/vanexeloxisaka.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/354b7c2d5098885ed0a5f1f08a379466/28864287031.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/divawidemisola.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf9e051f7---zevosidokukevakin.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807ef7a26cc---jirovovexivitibotixeba.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/nf70nn8a7jkvcle9gknqb82g6e/bajipip.pdfIn PDF document text
    • https://pindimana.in/uploads/file/ximegelufadamuba.pdfIn PDF document text
    • http://cycling-software.com/files/file/66328152539.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wiworu.pdfIn PDF document text
    • http://gloria-eurex.com/zaxeboribefe.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0817727d342f5dfb97551019d717a86/nurisat.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/18599223298.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f80da3df3048f33a2ca057b9b521a01a/niguxunafegeforopoba.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/krnhs8ddfg9144gq99tsskae20/liwopamoxefowowos.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/l4nqgklefohjfvj3l9cba4nsp3/jufidotemimewe.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/7046622594.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58fabad243---tuvok.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/4047629474.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/lpd1b4j2evhkur0k30gs7qf3qr/jikudoxunujabesarifukuj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bcc0f2d9---56872608359.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/58979389368.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafa4ddba28---bepopugekoviz.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b489fb9352---xawusinexukaduwibav.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acce663cb08---47144617704.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0092469212f838fa0621e62f49c03362/vuser.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/87cb6fac210a42d48bd55b558cc0d4ba/67474686817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=decipher+numbers+to+lettersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A31 10716 bytes
SHA-256: 9e9ad5d93a5024d067945d5cac6b4422c7e96a520a768de3703a1794e3b2e82e
font_02_sfnt_off0001625f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625F 19104 bytes
SHA-256: 7c6028b571950069bde4e85af18277f1f745f29cc74c81726234ecf845cf872c
font_03_sfnt_off000193ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193AD 17068 bytes
SHA-256: 25292f0942779e016c994a6066c6df065c1fc3093950905f67751fc871297458