Malicious PDF — malware analysis report

Static analysis result for SHA-256 48837926a679b7d0…

MALICIOUS

PDF

80.1 KB Created: 2021-06-30 20:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91c8cd2cb077361410dd625e71c51876 SHA-1: 08e2a33f977b3f6e90ccc3d84041e7857e6a3853 SHA-256: 48837926a679b7d0dc6ae6eaddef09eea5beab430bb849a773227098aec63972
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, which in turn host other PDF files. This indicates a link farm strategy likely designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0988197d---98535112690.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fd1718509---99923204657.pdf
    • http://pinxedien.net/upload/files/fizupe.pdf
    • http://doks-films.com/pcms/content/file/38240281193.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd411aded---dabutofo.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/13cf51cf996bb1835c11aded1097de73/pisadatavoturutixuda.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f6e05e33---jeraxe.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49442f14d---xiludijojiras.pdf
    • https://divinenine.net/userfiles/file/73630268474.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a946e1277---90216312235.pdf
    • http://ronaldtan.nl/images/photo/digumava.pdf
    • http://polletnv.be/uploads/files/61974869804.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbeea90d4---97034089800.pdf
    • http://alliance-ic.ru/uploads/file/gisuxabeguj.pdf
    • http://jjinline.org/file_upload/file/jemurokoxivimekomevup.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cf524a176f6f602e81e6026368c350c2/71110293616.pdf
    • http://hydrem.ru/images/file/pajilamofamefexor.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/uh6jbqmqk5ftrbk57s6na03o22/wukix.pdf
    • http://ifa-astrologie.de/userfiles/file/sagojexuvob.pdf
    • http://suttonoakfarms.com/clients/880813/File/nufeki.pdf
    • http://sergey-yushkov.com/pict/file/jomirakolevolujimofemilu.pdf
    • https://p99.tw/pro_pic/files/94539038816.pdf
    • http://salon-urody-bellis.pl/images/file/pikunapijusanidubugomo.pdf
    • https://dodatnagarancija.com/userfiles/file/gomiwusezuwewokeripomo.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/50133582727.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a136025a44605f380ef2ec440cd28dc4/kutoxabitulegek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chisago+county+property+records
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 16792 bytes
font_01_sfnt_off0000eb62.bin
db2600fb9f46e1d623ecf4c945d05af2f487eefc9c70672f329856e9e2d3ee8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 10992 bytes
font_02_sfnt_off000104bd.bin
a4ed652f29fca38b1ab9ac0c77797c9f737e642bb8868dac9b69958afd1bf7c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 17036 bytes