Malicious PDF — malware analysis report

Static analysis result for SHA-256 35191af4840d2460…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcab1acbdfb861ae40cb6c5fb2687c0d SHA-1: 7b6be4ae46cafcdd2c4b898a7d7ab0e448c8723d SHA-256: 35191af4840d2460fbd6e57ed5326688d6bf6007139169b95f495ad40802cdd5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external URLs, many of which are hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded links likely serve to redirect the user to a site hosting a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6941

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mai-colle.jp/userfiles/file/33649591995.pdf In PDF document text
    • http://ahdjcm.com/upload/files/tigumubeteromifuzuja.pdfIn PDF document text
    • https://kaisar168.com/contents/files/17570815326.pdfIn PDF document text
    • https://tavio.ru/files/file/jevul.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc430bbec---bawaluzavoxad.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/fejujagawe.pdfIn PDF document text
    • http://stylekd.ru/files/34286043248.pdfIn PDF document text
    • http://usagimatur.com/files/others/39052254234.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/82048500352.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/bec3283ff85bc511fddbc21c3f405651/lowapasuvogut.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e79a39e6d---senuwutatoge.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/timusuxolowavoruw.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kiruzotofawepugalatujo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pg7rr3cbcl0q67smhi2atqlsop/nariw.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df6f4258f---rilepuvuvegigugij.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8nlmfciae1p7vtpo5o93p97p3d/16910042084.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/84677304516.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/63440316173.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/folazusi.pdfIn PDF document text
    • http://bamila.vn/luutru/files/sekurizivutudawiwal.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/25014696813.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/63024004739.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6c639ea32ec63128e6961198067ba30c/vuzavomobabufasinex.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/10140743938.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/mevurefano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=nematology+notes+pdfPDF link annotation
    • 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_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 16872 bytes
SHA-256: 7b3a38ad0ca3a38b8dd1daa99bb3d07ae45f0200a8175f412711f57f7ae91636
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 10740 bytes
SHA-256: 59c3195ae93d8f8024e08bd86217685474374c48c1a8a45c77660365dedaad5b

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