Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d7a8e41a44eea6…

MALICIOUS

PDF

99.3 KB Created: 2021-07-06 21:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ba054f3c805353a5da0932c5939afee SHA-1: 4609668f0e888c0c5077148c63d70ef36fa0e8f1 SHA-256: b1d7a8e41a44eea6eebbef6f9ba7e6a3f548ddd0e1058aa77f73cef0cc8a2737
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. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ikkosushi.com/uploads/files/kesamowasuf.pdf In PDF document text
    • https://petala.gr/userfiles/file/fofis.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/22nbpnu893lo3i9ad9355cvae2/4263291056.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/b6e255be38302a23bd46e577750dceb7/62710356657.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d10b0a70644686ffddda3035f3bdf606/bulawuwefit.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/jabivexinapemowofitonefu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nanobufenobebu.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7720c7bd7---33584704555.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609093abbf22b---meziluf.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084426536793---35280801202.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/foseviwulalefilu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/mawudepuvogirekevuwu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/96583395414.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uqdr9jh6o0rsacpfsc4akc3466/jaberovixisitesem.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/banolijite.pdfIn PDF document text
    • https://highrise.pl/file/dugazizuzoj.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/faadd20cd80ec1360ddaf25f817fa5e3/zejorozuzanar.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/72922384915.pdfIn PDF document text
    • http://chpcentre.com/files/file/63788873027.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab779ae7362---pefakimevaso.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/96419186995.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/conn4adio07kra76beto49s7r4/87172407848.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0700d8bf354683cf571dda16ead75de7/fulegozarimamewedeledo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa597ba0875---toxelogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+ultimate+pricePDF 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_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 10312 bytes
SHA-256: 5ec345e2ea34dba600a620226954a7401acc8509624d3ddfc301ee09aea9fcfd
font_01_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 17932 bytes
SHA-256: 8029bed43e060930a03134669fdd01de54e6ad59170364df6f1bc82cdf4fb4a3
font_02_sfnt_off000167df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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